Core chuck



FIG. 1 is a top perspective view of a core chuck showing my design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a back elevation view thereof;

FIG. 5 is a side elevation view thereof, opposite side being a mirror image thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines present in the figures are included for the purpose of illustrating portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for the core chuck, as shown and described. 